MPS EV3204DJ-00A User manual

EV3204DJ-00A
Fixed Frequency
White LED Driver
EV3204DJ-00A Rev. 1.1 www.MonolithicPower.com 1
10/18/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
GENERAL DESCRIPTION
The MP3204 is a step-up converter designed
for driving up to 5 series white LEDs from a
single cell Lithium Ion battery. The MP3204
uses current mode, fixed frequency architecture
to regulate the LED current, which is measured
through an external current sense resistor. Its
low 104mV feedback voltage reduces power
loss and improves efficiency. The OV pin
monitors the output voltage and turns off the
converter if an over-voltage condition is present
due to an open circuit condition.
The MP3204 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload.
ELECTRICAL SPECIFICATION
Parameter Symbol Value Units
Input Voltage VIN 2.5 to 6 V
Number of WLEDs 1 to 5
FEATURES
•On Board Power MOSFET
•Drives up to 5 Series White LEDs
•Up to 87% Efficiency
•Over 1MHz Fixed Switching Frequency
•Open Load Shutdown
•Low 104mV Feedback Voltage
•Soft-Start/PWM Dimming
•UVLO, Thermal Shutdown
•Internal Current Limit
APPLICATIONS
•Cell Phones
•Handheld Computers and PDAs
•Digital Still Cameras
•Small LCD Displays Application
“MPS” and “The Future of Analog IC Technology” are Trademarks of
Monolithic Power Systems, Inc.
EV3204DJ-00A EVALUATION BOARD
Dimensions (1.9”X x 1.8”Y x 0.4”Z)
Board Number MPS IC Number
EV3204DJ-00A MP3204DJ
88
87
86
85
84
83
82
81
80
79
78
77
EFFICIENCY (%)
5 101520
LED CURRENT (mA)
MP3204-EC01
Efficiency vs
LED Current
3 LEDs
4 LEDs
VIN=3.6V
5 LEDs

EV3204DJ-00A – FIXED FREQUENCY WHITE LED DRIVER
EV3204DJ-00A Rev. 1.1 www.MonolithicPower.com 2
10/18/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
TM
EVALUATION BOARD SCHEMATIC
OFF ON
MP3204
VIN
LED3
LED1
LED2
LED4
LED5
EV3204_S01
D1
B0530WS-7
30V
500mA
U1
IN
EN
GND
OV
FB
SW
EV3204DJ-00A BILL OF MATERIALS
Qty Ref Value Description Package Manufacturer Manufacturer P/N
1 C1 2.2µF Ceramic Capacitor, 10V, X5R 0805 TDK C2012X5R1A225K
1 C2 0.22µF Ceramic Capacitor, 25V, X7R 0805 TDK C2012X7R1E224K
1 D1 Diode Schottky, 30V, 0.5A SOD-323 Diodes Inc. B0530WS-7
1 L1 22µH Inductor, 330mA D31FB Toko 984FB-220M
5
LED1,
LED2,
LED3,
LED4,
LED5
Not Stuffed
1 R1 100kΩResistor, 5% 0805 Panasonic ERJ-6GEYJ104V
1 R2 5.1ΩResistor, 1% 0805 Panasonic ERJ-6GEYJ5R1V
1 U1
Fixed Frequency, White LED
Driver TSOT23-6 MPS MP3204DJ

EV3204DJ-00A – FIXED FREQUENCY WHITE LED DRIVER
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EV3204DJ-00A Rev. 1.1 www.MonolithicPower.com 3
10/18/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
TM
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer Figure 2—Top Layer
QUICK START GUIDE
1. Solder LED1 through LED5 to the board.
2. Connect the positive and negative terminals of power supply (2.5V to 6V) to VIN and GND pins,
respectively.
3. Drive EN high to turn on the MP3204; low to shut it down.
4. To use burst-mode brightness control, drive EN with a PWM signal.